It is distinguished from canoeing by the sitting position of the paddler and the number of blades on the paddle.
A kayak is a boat where the paddler faces forward, legs in front, using a double-bladed paddle.
Some of the many popular uses of canoes and kayaks include: Materials used in modern designs – modern kayaks are usually made from Rotationally Molded Plastic (Rotomold), Fiberglass or Kevlar, each of which has advantages and disadvantages.
Whitewater kayak/canoe - most designs are easily converted from kayak (K-1) to canoe (C-1) by changing the seat.
Whitewater – water thrashed around and aerated by the turbulence of a fast enough rapid that some of it turns frothy white.